Drop attacks stem from diverse mechanisms, including orthopedic causes (for example, leg weakness and knee instability), hemodynamic causes (for example, transient vertebrobasilar insufficiency, a type of interruption of blood flow to the brain), and neurologic causes (such as epileptic seizures or unstable vestibular function), among other reasons ...
ËpÃ¦l i-) adj. (sometimes l.c.) of, designating, or characteristic of the early phase of the Stone Age: usu. divided into three periods (Lower Paleolithic, c2,000,000âc200,000 b.c., Middle Paleolithic, c150,000âc40,000 b.c., Upper Paleolithic, c40,000âc10,000 b.c.).
By Shelley Esaak. The Paleolithic (literally: Old Stone Age) period covered between two and one-half to three million years, dependent upon which scientist has done the calculations.